risingwave_connector/source/kafka/
split.rs

1// Copyright 2022 RisingWave Labs
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15use risingwave_common::types::JsonbVal;
16use serde::{Deserialize, Serialize};
17
18use crate::error::ConnectorResult;
19use crate::source::{SplitId, SplitMetaData};
20
21#[derive(Clone, Serialize, Deserialize, Debug, PartialEq, Hash)]
22pub struct KafkaSplit {
23    pub(crate) topic: String,
24    pub(crate) partition: i32,
25    /// Note: currently the start offset is **exclusive**. We need to `+1` to create the reader.
26    /// Possible values are:
27    /// - `Earliest`: `low_watermark` - 1
28    /// - `Latest`: `high_watermark` - 1
29    /// - `Timestamp`: `offset_for_timestamp` - 1
30    /// - `last_seen_offset`
31    ///
32    /// A better approach would be to make it **inclusive**. <https://github.com/risingwavelabs/risingwave/pull/16257>
33    pub(crate) start_offset: Option<i64>,
34    pub(crate) stop_offset: Option<i64>,
35}
36
37impl SplitMetaData for KafkaSplit {
38    fn id(&self) -> SplitId {
39        // TODO: should avoid constructing a string every time
40        format!("{}", self.partition).into()
41    }
42
43    fn restore_from_json(value: JsonbVal) -> ConnectorResult<Self> {
44        serde_json::from_value(value.take()).map_err(Into::into)
45    }
46
47    fn encode_to_json(&self) -> JsonbVal {
48        serde_json::to_value(self.clone()).unwrap().into()
49    }
50
51    fn update_offset(&mut self, last_seen_offset: String) -> ConnectorResult<()> {
52        self.start_offset = Some(last_seen_offset.as_str().parse::<i64>().unwrap());
53        Ok(())
54    }
55}
56
57impl KafkaSplit {
58    pub fn new(
59        partition: i32,
60        start_offset: Option<i64>,
61        stop_offset: Option<i64>,
62        topic: String,
63    ) -> KafkaSplit {
64        KafkaSplit {
65            topic,
66            partition,
67            start_offset,
68            stop_offset,
69        }
70    }
71}
risingwave_connector/source/kafka/split.rs

risingwave_connector/source/kafka/
split.rs
